UT 38 =
hybrid turbo build from a T34 turbo.

but a t34 stage 3 with 360° bearings and cut back blades will suit up to 430 bhp normally, with low lag.
also need an big turbo manifold

you can go different ways:

first:
l8 ecu/P8 ecu with software (several dealers carry that) for that (grey injectors) incl. Weber Marelli loom engine sided, then you ll need a big turbo throttle body also, because the small turbo manifold won't work with that ecu (without modification to the TB)

second:
Go for an aftermarket ecu like Omex, Autronics, DTA or so...
get a bigger turbo, get everything mapped...